单项选择题
A．They extend their water pipes. B．They give out faint cries. C．They make noises to drive away insects. D．They become elastic like rubber bands.
A．Looking for a postcard. B．Visiting the Brownings. C．Filling in a form. D．Writing a postcard.
A．A kind of German sausage. B．A resident of Frankfurt. C．A kind of German bread. D．The name of a German town.